Corrected/Modified the page headlines and navigation side-bar to match with eachother

Closes #243 (closed)

Please note that following changes have not been done because of lack of information:

1. Environment and Softwares > Containers > Singularity: (Virtual Machines Tools != Singularity on Partition ml)
2. HPC Resources and Jobs > HPC Resources > (HPE Superdome Flex != Large Shared-Memory Node - HPE Superdome Flex)i
3. Archive of the Old Wiki